Compressor Short-Cycling Delay; Heat Pump Cooling Operational Range; Heat Pump Heating Operational Range; Outdoor Temperature Operational Range - Lennox XP25-024-230-01 Installation And Service Procedure

COMPRESSOR SHORT-CYCLING DELAY

The outdoor control protects the compressor from:
•
Short-cycling (five minutes) when there is initial power
up
•
Interruption in power to the unit
•
Pressure or sensor trips
•
Delay after demand is removed.
The delay is set by default for 300 seconds (five minutes) but
can be changed through the thermostat interface.
Available settings are 60, 120, 180, 240 and 300 seconds.
COMPRESSOR SHIFT DELAY
The outdoor control has a field-selectable option (ON or
OFF), selected through the thermostat interface, which
Temperature
C°
Above Above
(-) 20°C
At or Below At or Below
(-) 20°C
Temperature
C°
Above Above
(-) 26°C (-) 15°F
At or Below At or Below
(-) 26°C (-) 15°F
NOTE - If system conditions are outside the specified ranges, the outdoor control may reduce, terminate, or prevent system
operation.
Table 10. Heat Pump Cooling Operational Range
F°
Room thermostat controls operation of outdoor unit.
NOTE - Below 65°F (18.3°C) the liquid line temperature sensor controls the outdoor fan speed (RPM)
(-) 4°F to maintain a liquid line temperature between 58°F (14.4°C) and 55°F (12.8°C).
NOTE - Minimum fan RPM is 300.
Outdoor unit cooling operation stopped by low ambient temperature protection (Status Code 601).
(-) 4°F
Table 11. Heat Pump Heating Operational Range
F°
Room thermostat controls operation of outdoor unit.
NOTE - If the outdoor unit is operating and the outdoor ambient temperature drops below -4°F
(-20°C), the unit continues to operate until the room thermostat demand is satisfied or the outdoor
temperature drops to -15°F (-26°C). If the outdoor unit stops running while the temperature is below
-4°F (-20°C), the unit remains OFF until outdoor temperature rises above -4°F (-20°C),
Outdoor unit heating operation stopped by low ambient temperature protection (Status Code 601).
NOTE - Room thermostat "Low Balance Point" minimum setting is -15°F (-26°C).
reduces sounds that occur while the unit is cycling in and out
of the defrost mode.
* When enabled, there is a 30-second compressor shift
delay which de-energizes the contactor output and ECM
fan outputs. After the delay expires, the contactor and
ECM, fan outputs are energized.
* When disabled, the reversing valve is shifted by
de-energizing the outputs.

Outdoor Temperature Operational Range

Use the chart below to determine the operational limits in
reference to outdoor temperatures.
Event
Event
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XP25